Degradation of diferent types of polyethylene using for lining system exposed to hydro chloride acid solution
This paper focuses on degradation behavior of a maleic anhydride
modified and another new modified polyethylene used for lining system as
anti-corrosion agent when exposed to hydrochloric acid solution
environment. Different concentrations of HCl solution
：
0, 10, and 20 mass％at temperatures of 40, 60, and 80°C were set to
investigate the
degradation behavior of the two types of modified polyethylene. Virgin
PE was also subjected to the same conditions for comparison. Weight
change, chloride element penetration, and changes in chemical structure
were measured.
The immersion test result showed that the diffusion of water and the HCl
solution into the neat PE obeyed Fickian diffusion model while those
into both modified PE obeyed Fickian mode at low temperatures only.
Two-saturation stages were observed for the samples immersed in HCl
solutions at 80°C
. The modified PE samples were degraded bythe HCl solutions while there
was no change of chemical structure for the case of the PE resin. The
high temperatureenhanced the order of degradation. IR spectra showed
structural changes, which maybe attributed to the modifiercomponents in
the polymers.
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